Following statements are regarding to gamete fusion and the prevention of polyspermy in mammals.

A. In mammals, it is not the tip of the sperm head that makes contact with the egg but the side of the sperm head.

B. The junction between the inner acrosomal membrane and the sperm cell membrane is called the acrosomal region, and this is where membrane fusion between sperm and egg begins.

C. Sperm-egg fusion appears to involve several proteins, two of which are Izumo, in the oocyte membrane, and Juno, in the acrosomal membrane.

D. These fusion proteins bind together and appear to recruit other proteins to make an adhesion and fusion complex.

Which of the following statements are correct?

#Question id: 8707

#Unit 9. Diversity of Life Forms

Use the figure to answer the following question

The phylogenetic tree shown ________.

#Question id: 8708

#Unit 9. Diversity of Life Forms

Concerning growth in genome size over evolutionary time, which of these is least associated with the others?

#Question id: 8709

#Unit 9. Diversity of Life Forms

Eukaryotes that are not closely related and that do not share many anatomical similarities can still be placed together on the same phylogenetic tree by comparing their ________.

#Question id: 8710

#Unit 9. Diversity of Life Forms

A phylogenetic tree constructed using sequence differences in mitochondrial DNA would be most valid for discerning the evolutionary relatedness of ________.

#Question id: 8712

#Unit 9. Diversity of Life Forms

The lakes of northern Minnesota are home to many similar species of damselflies of the genus Enallagma. These species have apparently undergone speciation from ancestral stock since the last glacial retreat about 10 thousand years ago. Sequencing which of the following would probably be most useful in sorting out evolutionary relationships among these closely related species?

#Question id: 8713

#Unit 9. Diversity of Life Forms

Which statement represents the best explanation for the observation that the nuclear DNA of wolves and domestic dogs has a very high degree of sequence homology? Dogs and wolves ________.